CN112292834B

CN112292834B - Method and communication device for selecting transmission mode

Info

Publication number: CN112292834B
Application number: CN201880094933.8A
Authority: CN
Inventors: 薛续磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-06-27
Filing date: 2018-06-27
Publication date: 2022-08-26
Anticipated expiration: 2038-06-27
Also published as: WO2020000265A1; CN112292834A

Abstract

The application provides a method for selecting a transmission mode and a communication device, wherein the method comprises the following steps: the network equipment sends first information to the terminal equipment, wherein the first information is used for indicating the terminal equipment to send data and reference signals through a double-antenna port; the network equipment receives the data and the reference signal sent by the terminal equipment; the network equipment determines the channel quality according to the reference signal; the network device determines to communicate with the terminal device through a single antenna port mode or a dual antenna port mode according to the channel quality. According to the technical scheme of the embodiment of the application, the uplink transmission mode of the terminal equipment can be flexibly selected, and the uplink transmission efficiency of the terminal equipment is improved.

Description

Method and communication device for selecting transmission mode

Technical Field

The present application relates to the field of communications, and more particularly, to a method and a communication apparatus for selecting a transmission mode.

Background

A multiple-input multiple-output (MIMO) technology is widely used in a communication system, where multiple transmit antennas and multiple receive antennas are respectively used in a network device and a terminal device, and a transmission mode of multi-layer parallel transmission is used to provide a higher data transmission rate and improve communication quality. The uplink single-user multiple-input multiple-output (SU-MIMO) technology refers to that a single user forms uplink MIMO through two transmitting antennas, wherein the uplink SU-MIMO includes two modes including a closed-loop spatial multiplexing mode (i.e., RANK2) and a closed-loop transmit diversity mode (i.e., RANK 1). When the channel quality is good, the user transmission scheme usually adopts a closed-loop space division multiplexing mode, so that the uplink capacity can be obviously improved; when the channel quality is poor, the user transmission scheme usually adopts a closed loop transmit diversity mode, so that the uplink signal quality of edge users can be improved, and the uplink coverage range is expanded.

The SU-MIMO technology relies on a network device to configure a user with channel Sounding Reference Signal (SRS) resources of two transmitting antenna ports, and the network device configures the SRS resources of the two transmitting antenna ports, and can periodically obtain channel measurements of the two transmitting antenna ports, so that the network device selects a closed-loop space division multiplexing mode and a closed-loop transmit diversity mode, and the uplink performance of the user device is optimal. However, the resources of the cell covered by the network device are limited, and the user equipment cannot use SU-MIMO under the condition that the SRS resources are limited, which may cause the uplink transmission efficiency of the user equipment to be reduced and affect the data transmission performance.

Disclosure of Invention

The application provides a method and a device for selecting a transmission mode, which can flexibly select an uplink transmission mode of terminal equipment in a scene that SRS resources are limited, and improve the uplink transmission efficiency of the terminal equipment.

In a first aspect, a method for selecting a transmission mode is provided, the method comprising:

the network equipment sends first information to the terminal equipment, wherein the first information is used for indicating the terminal equipment to send data and reference signals through a double-antenna port;

the network equipment receives the data and the reference signal sent by the terminal equipment;

the network equipment determines the channel quality according to the reference signal;

the network device determines to communicate with the terminal device through a single antenna port mode or a dual antenna port mode according to the channel quality.

In the technical solution of the embodiment of the present application, the channel quality of the dual-antenna port mode is measured by sending the reference signal, and the reference signal is sent simultaneously with the data through the data scheduling information, so that the terminal device can realize the optimization of the single-antenna port mode and the dual-antenna port mode in the scenario where SRS resources are limited, and improve the uplink transmission efficiency of the terminal device.

It should be understood that in embodiments of the present application, the reference signal may be a demodulation reference signal.

With reference to the first aspect, in some implementations of the first aspect, before the network device sends the first information to the terminal device, the method further includes:

the network device communicates with the terminal device through the single antenna port mode;

the network device configures the dual antenna port for the terminal device.

With reference to the first aspect, in certain implementation manners of the first aspect, the first information includes information indicating that the terminal device transmits the reference signal according to a precoding codebook of the dual antenna port mode, and the network device determines the channel quality according to the reference signal, including:

the network device demodulates the reference signal through the precoding codebook of the dual antenna port mode;

the network device determines a channel quality from the demodulated reference signal.

In the technical solution of the embodiment of the present application, the network device instructs the terminal device to detect the channel quality under different precoding codebooks of the dual antenna port mode by sending the first information, for example, the scheduling information, so as to demodulate the reference signal to determine the channel quality.

With reference to the first aspect, in certain implementations of the first aspect, the dual-antenna port mode includes a closed-loop spatial multiplexing mode, the first information includes a precoding codebook of the closed-loop spatial multiplexing mode, and the determining, by the network device, the channel quality according to the reference signal includes:

the network equipment demodulates the reference signal according to the precoding codebook of the closed-loop space division multiplexing mode;

the network device determines a channel quality of the closed-loop spatial multiplexing mode based on the demodulated reference signal.

In the technical solution of the embodiment of the present application, by detecting the channel quality of the closed-loop space division multiplexing mode included in the dual-antenna port mode, the closed-loop space division multiplexing mode of the dual-antenna port mode adopts a fixed codebook, so that the cost for detecting the channel quality is low and the detection is easier to implement, thereby determining a preferred transmission mode in the single-antenna port mode and the dual-antenna port mode, and improving the uplink transmission efficiency of the terminal device.

With reference to the first aspect, in certain implementations of the first aspect, the dual-antenna port mode includes a closed-loop spatial multiplexing mode, and the determining, by the network device, to communicate with the terminal device through the single-antenna port mode or the dual-antenna port mode according to the channel quality includes:

if the channel quality of the closed-loop space division multiplexing mode is better than that of the single-antenna port mode, the network equipment selects the closed-loop space division multiplexing mode to communicate with the terminal equipment; or

And if the channel quality of the closed-loop space division multiplexing mode is not better than the channel quality in the single-antenna port mode, the network equipment selects the single-antenna port mode to communicate with the terminal equipment.

In the technical solution of the embodiment of the present application, the network device determines a better uplink transmission mode according to the channel quality of the single antenna port mode and the dual antenna port mode by detecting the channel quality of the closed-loop space division multiplexing mode included in the dual antenna port mode, and improves the uplink transmission efficiency of the terminal device.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes:

and if the network equipment selects the closed-loop space division multiplexing mode to communicate with the terminal equipment, the network equipment sends second information to the terminal equipment, wherein the second information is used for indicating the terminal equipment to send the reference signal through a channel of the single-antenna port mode.

and if the channel quality of the single-antenna port mode is better than that of the closed-loop space division multiplexing mode, the network equipment communicates with the terminal equipment through the single-antenna port mode.

In the technical scheme of the embodiment of the application, when the network device communicates with the terminal device in the dual-antenna port mode, the network device sends second information, the second information is used for detecting channel quality in the single-antenna port mode, the channel quality in the single-antenna port mode is superior to the channel quality in the dual-antenna port mode, the network device instructs the terminal device to select the single-antenna port mode to communicate with the terminal device, an uplink transmission mode of the terminal device can be flexibly selected, and uplink transmission efficiency of the terminal device is improved.

With reference to the first aspect, in certain implementations of the first aspect, the first information is periodically sent information.

In the technical scheme of the embodiment of the application, the scheduling information sent by the network device to the terminal device may be periodic scheduling information, the terminal device is scheduled to send data, the terminal device sends a reference signal while sending the data, and the channel quality is detected according to the reference signal.

It should be noted that the first information may be scheduling information for a dual-antenna port when the network device and the terminal device communicate in the single-antenna port mode.

With reference to the first aspect, in some implementations of the first aspect, the second information is periodically sent information.

It should be noted that the second information may be scheduling information for a single antenna port when the network device and the terminal device communicate in the dual antenna port mode.

With reference to the first aspect, in certain implementations of the first aspect, the reference signal is a demodulation reference signal.

In a second aspect, a method for selecting a transmission mode is provided, the method comprising:

the method comprises the steps that terminal equipment receives first information sent by network equipment, wherein the first information is used for indicating the terminal equipment to send data and reference signals through a double-antenna port;

the terminal device sends the data and the reference signal to the network device through the dual-antenna port;

the terminal device receives third information sent by the network device, wherein the third information is used for indicating the terminal device to communicate with the network device through a single antenna port mode or a double antenna port mode.

In the technical scheme of the embodiment of the application, the channel quality of the dual-antenna port mode is measured by sending the reference signal, and the reference signal is sent simultaneously with data through the data scheduling information, so that the terminal equipment can realize the optimization of the single-antenna port mode and the dual-antenna port mode in the scene that the SRS resource is limited, and the uplink transmission efficiency of the terminal equipment is improved.

With reference to the second aspect, in some implementations of the second aspect, before the terminal device receives the first information sent by the network device, the method further includes:

the terminal device communicates with the network device via the single antenna port mode;

the terminal device obtains the dual-antenna port configured by the network device.

With reference to the second aspect, in some implementation manners of the second aspect, the sending, by the terminal device, the data and the reference signal to the network device through the dual antenna ports includes sending, by the terminal device, information indicating that the reference signal is sent according to a precoding codebook of the dual antenna port mode, and includes:

and the terminal equipment sends the reference signal according to the precoding codebook of the dual-antenna port mode.

In the technical scheme of the embodiment of the application, the terminal device detects the channel quality under the precoding codebooks of different dual-antenna port modes by sending the reference signal, so that the network device demodulates the reference signal to determine the channel quality.

With reference to the second aspect, in some implementations of the second aspect, the dual-antenna port mode includes a closed-loop spatial multiplexing mode, the first information includes a precoding codebook of the closed-loop spatial multiplexing mode, and the terminal device transmits the data and the reference signal according to the precoding codebook of the dual-antenna port mode, including:

the terminal equipment transmits the reference signal according to the precoding codebook of the closed-loop space division multiplexing mode.

In the technical solution of the embodiment of the present application, the terminal device detects the channel quality in the closed-loop space division multiplexing mode included in the dual-antenna port mode, and the closed-loop space division multiplexing mode in the dual-antenna port mode adopts the fixed codebook, so that the cost for detecting the channel quality is low and the detection is easier to implement, and thus the network device determines the preferred transmission mode in the single-antenna port mode and the dual-antenna port mode, and improves the uplink transmission efficiency of the terminal device.

With reference to the second aspect, in some implementations of the second aspect, the dual-antenna port mode includes a closed-loop spatial multiplexing mode, and the receiving, by the terminal device, third information sent by the network device includes:

if the channel quality of the closed-loop space division multiplexing mode is better than the channel quality of the single-antenna port mode, the terminal device receives third information sent by the network device, wherein the third information is used for indicating the terminal device to communicate with the network device through the closed-loop space division multiplexing mode; or

If the channel quality of the closed-loop space division multiplexing mode is not better than the channel quality of the single-antenna port mode, the terminal device receives third information sent by the network device, and the third information is used for indicating the terminal device to communicate with the network device through the single-antenna port mode.

In the technical solution of the embodiment of the present application, the terminal device sends the reference information while sending data to the network device, and by detecting the channel quality of the closed-loop space division multiplexing mode included in the dual-antenna port mode, the network device determines a better uplink transmission mode according to the channel quality of the single-antenna port mode and the dual-antenna port mode, thereby improving the uplink transmission efficiency of the terminal device.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes:

and if the network equipment selects the closed-loop space division multiplexing mode to communicate with the terminal equipment, the terminal equipment receives second information sent by the network equipment, wherein the second information is used for indicating the terminal equipment to send the reference signal through a channel of the single-antenna port mode.

if the channel quality of the single antenna port mode is better than the channel quality of the closed-loop space division multiplexing mode, the terminal device receives fourth information sent by the network device, and the fourth information is used for indicating the terminal device and the terminal device to communicate through the single antenna port mode.

With reference to the second aspect, in some implementations of the second aspect, the first information is periodically transmitted information.

In the technical solution of the embodiment of the present application, the scheduling information that the terminal device receives and sends by the network device may be periodic scheduling information, the terminal device sends data by scheduling, the terminal device sends reference signals while sending data, and the channel quality is detected according to the reference signals.

With reference to the second aspect, in some implementations of the second aspect, the second information is periodically transmitted information.

With reference to the second aspect, in certain implementations of the second aspect, the reference signal is a demodulation reference signal.

In a third aspect, a communication apparatus is provided, which includes:

the transceiver is used for sending first information to terminal equipment, wherein the first information is used for indicating the terminal equipment to send data and reference signals through a dual-antenna port;

the transceiver is further configured to transmit the data and the reference signal by the terminal device;

a processor for determining a channel quality from the reference signal;

and the processor is also used for determining to communicate with the terminal equipment through a single antenna port mode or a double antenna port mode according to the channel quality.

It should be understood that in embodiments of the present application, the communication device may be a network device.

It should be noted that, in the embodiment of the present application, the reference signal may be a demodulation reference signal.

With reference to the third aspect, in certain implementations of the third aspect, the transceiver is further configured to communicate with the terminal device through the single antenna port mode;

the processor is further configured to configure the dual antenna port for the terminal device.

With reference to the third aspect, in certain implementations of the third aspect, the processor is further configured to demodulate the reference signal through a precoding codebook of the dual antenna port mode;

the processor is further configured to determine a channel quality from the demodulated reference signal.

With reference to the third aspect, in certain implementations of the third aspect, the processor is further configured to demodulate the reference signal according to a precoding codebook of the closed-loop spatial multiplexing mode;

the processor is further configured to determine a channel quality of the closed-loop spatial multiplexing mode according to the demodulated reference signal.

In the technical solution of the embodiment of the present application, the network device detects the channel quality in the closed-loop space division multiplexing mode included in the dual-antenna port mode, and because the closed-loop space division multiplexing mode in the dual-antenna port mode uses a fixed codebook, the cost for detecting the channel quality is low and the detection is easier to implement, so that a preferred transmission mode is determined in the single-antenna port mode and the dual-antenna port mode, and the uplink transmission efficiency of the terminal device is improved.

With reference to the third aspect, in some implementations of the third aspect, the processor is configured to select the closed-loop spatial multiplexing mode to communicate with the terminal device if the channel quality of the closed-loop spatial multiplexing mode is better than the channel quality of the single-antenna port mode; or

And if the channel quality of the closed-loop space division multiplexing mode is not better than the channel quality in the single antenna port mode, the processor is configured to select the single antenna port mode to perform communication with the terminal device.

With reference to the third aspect, in some implementations of the third aspect, if the network device selects the closed-loop spatial multiplexing mode to communicate with the terminal device, the transceiver is further configured to send second information to the terminal device, where the second information is used to instruct the terminal device to send the reference signal through a channel in the single-antenna port mode.

With reference to the third aspect, in some implementations of the third aspect, the processor is configured to communicate with the terminal device through the single-antenna port mode if the channel quality of the single-antenna port mode is better than the channel quality of the closed-loop spatial multiplexing mode.

With reference to the third aspect, in some implementations of the third aspect, the first information is periodically transmitted information.

With reference to the third aspect, in some implementations of the third aspect, the second information is periodically transmitted information.

With reference to the third aspect, in certain implementations of the third aspect, the reference signal is a demodulation reference signal.

In a fourth aspect, there is provided a communication apparatus comprising:

the transceiver is used for receiving first information sent by network equipment, wherein the first information is used for indicating the terminal equipment to send data and reference signals through a dual-antenna port;

the transceiver is further configured to transmit the data and the reference signal to the network device through the dual antenna port;

the transceiver is further configured to receive third information sent by the network device, where the third information is used to instruct the terminal device to communicate with the network device in a single antenna port mode or a dual antenna port mode;

and the processor is used for selecting a single antenna port mode or a double antenna port mode to communicate with the network equipment according to the third information.

It should be understood that in the embodiments of the present application, the communication apparatus may be a terminal device.

With reference to the fourth aspect, in some implementations of the fourth aspect, the transceiver is further configured to communicate with a network device via the single antenna port mode;

the processor is further configured to obtain the dual-antenna port configured by the network device.

With reference to the fourth aspect, in some implementations of the fourth aspect, the transceiver is further configured to transmit the reference signal according to a precoding codebook of the dual antenna port mode.

In the technical solution of the embodiment of the present application, the terminal device detects the channel quality in precoding codebooks of different dual-antenna port modes by sending a reference signal, so that the network device demodulates the reference signal to determine the channel quality.

With reference to the fourth aspect, in some implementations of the fourth aspect, the transceiver is further configured to transmit the reference signal according to a precoding codebook of the closed-loop spatial multiplexing mode.

With reference to the fourth aspect, in some implementations of the fourth aspect, if the channel quality of the closed-loop spatial multiplexing mode is better than the channel quality of the single-antenna port mode, the transceiver is further configured to receive third information sent by the network device, where the third information is used to instruct the terminal device to perform communication with the network device through the closed-loop spatial multiplexing mode; or

If the channel quality of the closed-loop space division multiplexing mode is not better than the channel quality of the single-antenna port mode, the transceiver is further configured to receive third information sent by the network device, where the third information is used to instruct the terminal device to perform communication with the network device through the single-antenna port mode.

With reference to the fourth aspect, in some implementations of the fourth aspect, if the network device selects the closed-loop spatial multiplexing mode to communicate with the terminal device, the transceiver is further configured to receive second information sent by the network device, where the second information is used to instruct the terminal device to send the reference signal through a channel in the single antenna port mode.

With reference to the fourth aspect, in some implementation manners of the fourth aspect, if the channel quality of the single-antenna port mode is better than the channel quality of the closed-loop spatial multiplexing mode, the transceiver is further configured to receive fourth information sent by the network device, where the fourth information is used to instruct the terminal device and the terminal device to perform communication through the single-antenna port mode.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first information is periodically transmitted information.

In the technical scheme of the embodiment of the application, the scheduling information sent by the terminal device receiving network device may be periodic scheduling information, the terminal device is scheduled to send data, the terminal device sends reference signals while sending data, and channel quality is detected according to the reference signals.

With reference to the fourth aspect, in some implementations of the fourth aspect, the second information is periodically transmitted information.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the reference signal is a demodulation reference signal.

In a fifth aspect, a communication apparatus is provided, the apparatus comprising: a memory for storing a computer program; a processor configured to execute the computer program stored in the memory to cause the apparatus to perform the method of the first aspect or any of the possible implementations of the first aspect.

In a sixth aspect, a communication apparatus is provided, the apparatus comprising: a memory for storing a computer program; a processor for executing the computer program stored in the memory to cause the apparatus to perform the method of the second aspect or any of the possible implementations of the second aspect.

In combination with any of the above aspects, in some implementations, the communication device may be a chip.

In a seventh aspect, a readable storage medium is provided, which includes a program or instructions, when the program or instructions are executed on a computer, the method according to any one of the above first and second aspects or any one of the possible implementation manners thereof is executed.

In an eighth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any one of the above first and second aspects, or any possible implementation thereof.

Drawings

Fig. 1 is a schematic diagram of an application scenario of an embodiment of the present application.

Fig. 2 is an interaction flow diagram of a method of selecting a transmission mode according to an embodiment of the application.

Fig. 3 is a schematic block diagram of a communication device according to one embodiment of the present application.

Fig. 4 is a schematic block diagram of a communication device according to another embodiment of the present application.

Fig. 5 is a schematic block diagram of a communication device according to an embodiment of the present application.

Fig. 6 is a schematic block diagram of a communication device according to an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

It should be understood that the technical solutions of the embodiments of the present application may be applied to various communication systems, for example: a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a long term evolution (long term evolution, LTE) system, a LTE Frequency Division Duplex (FDD) system, a LTE Time Division Duplex (TDD) system, a universal mobile telecommunications system (universal mobile telecommunications system, UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a future fifth generation (5G) system, or a new radio NR (UMTS) system, etc.

It should also be understood that the technical solution of the embodiment of the present application may also be applied to various communication systems based on non-orthogonal multiple access technologies, such as Sparse Code Multiple Access (SCMA) systems, and certainly SCMA may also be referred to as other names in the communication field; further, the technical solution of the embodiment of the present application may be applied to a multi-carrier transmission system using a non-orthogonal multiple access technology, for example, an Orthogonal Frequency Division Multiplexing (OFDM) system using a non-orthogonal multiple access technology, a filter bank multi-carrier (FBMC), a General Frequency Division Multiplexing (GFDM) system, a filtered orthogonal frequency division multiplexing (F-OFDM) system, and the like.

It should also be understood that in this embodiment of the present application, a terminal device, which may be referred to as an access terminal, a User Equipment (UE), a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment, may communicate with one or more core networks via a Radio Access Network (RAN). An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capability, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), etc.

It should also be understood that, in the embodiment of the present application, the network device may be used to communicate with the terminal device, and the network device may be a Base Transceiver Station (BTS) in a GSM system or a CDMA system, a base station (node B, NB) in a WCDMA system, an evolved base station (eNB or eNode B) in an LTE system, or a relay station, an access point, a vehicle-mounted device, a wearable device, a network side device in a future 5G network, or a network device in a future evolved PLMN network, or the like.

The embodiment of the application can be suitable for an LTE system, a subsequent evolution system such as 5G and the like, or other wireless communication systems adopting various wireless access technologies such as systems adopting access technologies such as code division multiple access, frequency division multiple access, time division multiple access, orthogonal frequency division multiple access, single carrier frequency division multiple access and the like.

It should be understood that a multiple-input-multiple-output (MIMO) technique refers to using a plurality of transmitting antennas and receiving antennas at a transmitting end device and a receiving end device, respectively, so that signals are transmitted and received through the plurality of antennas of the transmitting end device and the receiving end device, thereby improving communication quality. The multi-antenna multi-transmission multi-receiving system can fully utilize space resources, realize multi-transmission and multi-reception through a plurality of antennas, and improve the system channel capacity by times under the condition of not increasing frequency spectrum resources and antenna transmitting power. MIMO can be classified into single-user multiple-input multiple-output (SU-MIMO) and multi-user multiple-input multiple-output (MU-MIMO).

Fig. 1 is a schematic diagram of a communication system used in an embodiment of the present application. As shown in fig. 1, the communication system 100 includes a network device 102, and the network device 102 may include multiple antenna groups. Each antenna group can include one or more antennas, e.g., one antenna group can include

antennas

104 and 106, another antenna group can include antennas 108 and 110, and an additional group can include

antennas

112 and 114. 2 antennas are shown in fig. 1 for each antenna group, however, more or fewer antennas may be utilized for each group. Network device 102 can additionally include a transmitter chain and a receiver chain, each of which can comprise a plurality of components associated with signal transmission and reception, such as processors, modulators, multiplexers, demodulators, demultiplexers, antennas, and so forth, as will be appreciated by one skilled in the art.

Network device 102 may communicate with multiple terminal devices, for example, network device 102 may communicate with terminal device 116 and terminal device 122. However, it is understood that network device 102 may communicate with any number of terminal devices similar to

terminal devices

116 or 122.

End devices

116 and 122 may be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable device for communicating over wireless communication system 100.

As shown in fig. 1, terminal device 116 is in communication with

antennas

112 and 114, where

antennas

112 and 114 transmit information to terminal device 116 over forward link 118 and receive information from terminal device 116 over reverse link 120. In addition, terminal device 122 is in communication with

antennas

104 and 106, where

antennas

104 and 106 transmit information to terminal device 122 over forward link 124 and receive information from terminal device 122 over reverse link 126.

In a frequency division duplex, FDD system, forward link 118 can utilize a different frequency band than that used by reverse link 120, and forward link 124 can utilize a different frequency band than that used by reverse link 126, for example.

As another example, in a Time Division Duplex (TDD) system and a full duplex (full duplex) system, forward link 118 and reverse link 120 can utilize a common frequency band and forward link 124 and reverse link 126 can utilize a common frequency band.

Each group of antennas and/or area designed for communication is referred to as a sector of network device 102. For example, antenna groups may be designed to communicate to terminal devices in a sector of the areas covered by network device 102. During communication by network device 102 with

terminal devices

116 and 122 over

forward links

118 and 124, respectively, the transmitting antennas of network device 102 may utilize beamforming to improve signal-to-noise ratio of

forward links

118 and 124. Moreover, mobile devices in neighboring cells can be subject to less interference when network device 102 utilizes beamforming to transmit to

terminal devices

116 and 122 scattered randomly through an associated coverage than if the network device were transmitting through a single antenna to all its terminal devices.

At a given time, network device 102, terminal device 116, or terminal device 122 may be a wireless communication transmitting apparatus and/or a wireless communication receiving apparatus. When sending data, the wireless communication sending device may encode the data for transmission. Specifically, the wireless communication transmission apparatus may acquire a certain number of data bits to be transmitted to the wireless communication reception apparatus through the channel, for example, the wireless communication transmission apparatus may generate, receive from another communication apparatus, or save in a memory or the like a certain number of data bits to be transmitted to the wireless communication reception apparatus through the channel. Such data bits may be contained in a transport block or transport blocks of data, which may be segmented to produce multiple code blocks.

In addition, the communication system 100 may be a public land mobile network PLMN network or a device to device (D2D) network or a machine to machine (M2M) network or other networks, and fig. 1 is a simplified schematic diagram for ease of understanding only, and other network devices may be included in the network, which is not shown in fig. 1.

For the sake of understanding, the following description will be given of terms related to the embodiments of the present application.

Code word: refers to data after channel coding of a traffic stream from an upper layer. Different codewords distinguish different data streams, and the purpose is to transmit multiple paths of data through MIMO to realize spatial multiplexing.

Layer (b): since the number of codewords is not consistent with the number of transmit antenna ports, the stream of codewords needs to be mapped to different transmit antenna ports. Layer mapping and precoding are actually two sub-processes of the "mapping codewords to antenna ports" process. Layer mapping first remaps the codeword stream to multiple layers (new data streams) according to a certain rule. Precoding maps the data to different antenna ports.

Pre-coding: mapping from layer to antenna port is achieved.

An antenna port: the logical port for transmission does not have a one-to-one correspondence with the physical antennas, and one antenna port and data corresponding to the antenna port can be sent on one physical antenna or multiple physical antennas.

Single antenna port mode: the terminal device may support 1 antenna port to transmit the uplink signal, for example, the uplink signal of the terminal device is transmitted by using antenna port 0.

Dual antenna port mode: the terminal device may support 2 antenna ports to transmit uplink signals, for example, the uplink signals of the terminal device are transmitted through antenna port 0 and antenna port 1.

Closed loop: which may be referred to as a feedback control system, compares a measured value of the system output with a desired set point to produce an offset signal, which is used to make the regulation control to bring the output value as close as possible to the desired value.

Closed-loop spatial multiplexing mode: the terminal is required to feed back channel information, and the transmitting terminal performs signal preprocessing according to the fed back channel information to generate spatial independence. The method is suitable for improving the uplink transmission capacity under the scene with better channel conditions.

Closed loop transmit diversity mode: the receiving end needs to use the feedback channel to feed back a parameter related to transmit diversity (e.g., a precoding vector required by transmit diversity, indicated by precoding indication information) to the transmitting end, and the transmitting end uses the feedback information to complete transmit diversity after receiving. The method is suitable for the scene with poor channel conditions, and can improve the uplink signal quality of edge users and enlarge the uplink coverage range.

Fig. 2 shows a schematic flow chart of a method 200 of selecting a transmission mode according to an embodiment of the present application. The method 200 may be applied to the communication system 100 shown in fig. 1, but the embodiment of the present application is not limited thereto.

S210, the network equipment sends first information to the terminal equipment, and the first information is used for indicating the terminal equipment to send data and reference signals through the double-antenna port.

It should be understood that, in the embodiment of the present application, the first information may be data scheduling information, and the reference signal may be a demodulation reference signal, and when the network device receives the data scheduling information sent by the terminal device, the network device sends the data and the reference signal.

In an embodiment of the application, a terminal device receives first information sent by a network device, where the first information is used to instruct the terminal device to send data and reference signals through a dual-antenna port.

Optionally, in an embodiment of the present application, before a network device sends first information to a terminal device, the network device communicates with the terminal device through the single antenna port mode; and the network equipment configures the double-antenna port for the terminal equipment. Namely, the terminal device uses a single antenna port mode when accessing the network, after the terminal device establishes communication connection with the network device, the network device configures a dual antenna port to the terminal device, and then the network device can schedule the terminal device to transmit a reference signal through the dual antenna port, thereby detecting the channel quality of the dual antenna port.

In an embodiment of the present application, the first information may be periodically transmitted information. For example, in the single antenna port mode, the probing of the dual antenna ports is performed for 10ms every 1 second.

In the embodiment of the present application, the network device may send scheduling information, for example, the first information, to the terminal device, and the scheduling terminal device detects channel quality in the dual-antenna port mode, and sends a reference signal through the dual-antenna port by the scheduling terminal device, so as to detect channel quality of the dual-antenna port.

S220, the network equipment receives the reference signal sent by the terminal equipment.

It should be understood that, in the embodiment of the present application, the terminal device sends a reference signal to the network device for probing the channel quality. The reference signal may be a demodulation reference signal transmitted simultaneously with the data, and the demodulation reference signal may be transmitted simultaneously with the data according to data scheduling information transmitted by the network device to the terminal device.

It should be noted that, in the embodiment of the present application, the reference signal may be a demodulation reference signal, and may also be another reference signal, which is not limited in the embodiment of the present application.

It should be noted that uplink SU-MIMO is uplink MIMO formed by a single UE through two transmit antennas, and includes two modes, namely, closed-loop spatial multiplexing (i.e., RANK2) and closed-loop transmit diversity (i.e., RANK 1). That is, it can be understood that the dual antenna port mode includes two modes of closed loop space division multiplexing (i.e., RANK2) and closed loop transmit diversity (i.e., RANK 1).

When the channel quality is good, the UE transmission scheme is closed-loop space division multiplexing, and the uplink capacity can be remarkably improved; when the channel quality is poor, the UE transmission scheme is closed-loop transmit diversity, so that the uplink signal quality of edge users can be improved, and the uplink coverage range is enlarged.

According to the current protocol, a fixed precoding codebook can be adopted in the closed-loop space division multiplexing mode, and 6 precoding codebooks can be adopted in the closed-loop transmit diversity mode, so that an optimal codebook can be selected. Table 1 shows 6 precoding codebooks in the closed loop transmit diversity mode.

TABLE 1

To improve uplink throughput, a closed-loop spatial multiplexing mode may be supported in LTE. In the closed-loop space division multiplexing mode, the network device may select a best-matched precoding matrix from a corresponding codebook list specified by a protocol according to channel state information, and transmit a precoding matrix indication corresponding to the matrix to the terminal device.

Optionally, in an embodiment of the present application, the first information includes information indicating that the terminal device sends the reference signal according to the precoding codebook of the dual antenna port mode, and the determining, by the network device, the channel quality according to the reference signal includes:

the network equipment demodulates the reference signal through the precoding codebook of the dual-antenna port mode;

the network device determines channel quality based on demodulating the reference signal.

Optionally, in an embodiment of the present application, the dual-antenna port mode includes a closed-loop spatial multiplexing mode, the first information includes a precoding codebook of the closed-loop spatial multiplexing mode, and the determining, by the network device, the channel quality according to the reference signal includes:

and the network equipment determines the channel quality of the closed-loop space division multiplexing mode according to the demodulated reference signal.

It should be noted that the closed-loop space division multiplexing mode may use a fixed precoding codebook, so that the channel quality cost for the terminal device to detect the closed-loop space division multiplexing mode in the dual-antenna port mode is lower and is easier to implement. However, the terminal device may also detect channel quality of 6 precoding codebooks in the closed-loop transmit diversity mode in the dual-antenna port mode, so as to determine an optimal codebook in the 6 precoding codebooks.

In the embodiment of the present application, the terminal device may determine a precoding matrix according to information of a precoding codebook included in the first information sent by the network device, so as to send a reference signal, and determine the channel quality of the precoding matrix.

For example, in the embodiment of the present application, the network device may respectively detect channel qualities under each coding codebook according to the coding codebooks shown in table 1, so as to determine a best matching precoding codebook.

In an embodiment of the present application, for example, the first information includes a fixed codebook used for closed-loop space division multiplexing, the terminal device transmits a reference signal according to the codebook, and the network device demodulates the reference information according to the codebook after receiving the reference signal, thereby determining the channel quality.

In an embodiment of the present application, for example, the first information includes a precoding codebook for closed-loop transmit diversity, such as 6 coding matrices in table 1, the network device may schedule any one of the precoding codebooks, so that the terminal device sends a reference signal according to the specified precoding codebook, and the network device demodulates the reference information according to the codebook after receiving the reference signal, thereby determining the channel quality.

For example, the first information includes precoding codebooks for closed-loop transmit diversity, such as 6 coding matrices in table 1, the network device may schedule each of the precoding codebooks, so that the terminal device sends a reference signal according to each of the precoding codebooks, and the network device demodulates the reference information according to the codebooks after receiving the reference signal, thereby determining an optimal coding matrix of the 6 coding matrices according to channel quality.

It should be noted that, in the embodiment of the present application, a fixed precoding codebook is used in a closed-loop space division multiplexing mode included in a dual-antenna port mode, and 6 precoding codebooks are used in a closed-loop transmit diversity mode, which takes the sounding cost into consideration. The network device may preferentially schedule the terminal device to transmit the reference signal according to a precoding codebook of the closed-loop space division multiplexing mode, and the network device determines the channel quality of the closed-loop space division multiplexing mode according to the demodulated reference signal.

It should be understood that, in the embodiment of the present application, the network device may also send a reference signal based on the 6 scheduling terminal device precoding codebooks in table 1, so as to determine channel quality under the 6 precoding codebooks, and determine an optimal precoding codebook, that is, a best matching precoding matrix, in the 6 precoding codebooks.

For example, in this application example, the terminal device establishes a connection with the network device using a single antenna port mode, the network device configures a dual antenna port to the terminal device, and schedules the terminal device to send a reference signal to detect channel qualities of different dual antenna port modes, which includes but is not limited to the following three modes:

the method I comprises the following steps: after the network device establishes a connection with the terminal device in the single antenna port mode, the network device sends scheduling information, such as first information, to the terminal device, and detects channel quality of the terminal device in a closed-loop spatial multiplexing mode in the dual antenna port mode.

It should be understood that the scheduling information sent by the network device includes a specific precoding codebook, and a fixed precoding codebook is adopted in the closed-loop spatial multiplexing mode.

The second method comprises the following steps: after the network device establishes a connection with the terminal device in the single antenna port mode, the network device sends scheduling information, such as first information, to the terminal device, and detects channel quality of the terminal device in the closed loop transmit diversity mode in the dual antenna port mode.

It should be understood that the scheduling information sent by the network device includes a specific precoding codebook, and 6 precoding codebooks are adopted in the closed loop transmit diversity mode, as shown in fig. 1. The network device may specify a certain precoding codebook in the scheduling information, and may also schedule each of the 6 precoding codebooks, respectively, thereby determining the optimal codebook.

The second method comprises the following steps: after the network device establishes a connection with the terminal device in the single antenna port mode, the network device sends scheduling information, such as first information, to the terminal device, and detects channel quality of the device in a closed-loop spatial multiplexing mode in the dual antenna port mode and channel quality of the terminal device in a closed-loop transmit diversity mode in the dual antenna port mode, respectively.

And S230, the network equipment determines the channel quality according to the reference signal.

And S240, the network equipment determines to communicate with the terminal equipment through a single antenna port mode or a double antenna port mode according to the channel quality.

In an embodiment of the present application, a network device determines, according to the channel quality, to communicate with the terminal device through a single antenna port mode or a dual antenna port mode, and the network device sends third information to the terminal device, where the third information is used to instruct the terminal device to communicate with the network device through the single antenna port mode or the dual antenna port mode.

The network device may obtain, according to the reference signal sent by the terminal device, channel qualities in different transmission modes, for example, the channel quality in a single antenna port mode, the channel quality in a closed-loop spatial multiplexing mode in a dual antenna port mode, and the channel qualities in different precoding codebooks in a closed-loop transmit diversity mode in a dual antenna port mode. And the network equipment determines to communicate with the terminal equipment through a single antenna port mode or a double antenna port mode according to the channel quality.

The following is a description of the closed-loop spatial division multiplexing mode in the single-antenna port mode and the dual-antenna port mode as an example, and it should be understood that similarly, the selection may be made between the closed-loop transmit diversity mode in the single-antenna port mode and the dual-antenna port mode.

Optionally, in an embodiment of the present application, if the channel quality of the closed-loop spatial multiplexing mode is better than the channel quality of the single antenna port mode, the network device selects the closed-loop spatial multiplexing mode to communicate with the terminal device;

for example, the network device sends third information to the terminal device, where the third information is used to instruct the terminal device to communicate with the network device through the closed-loop space division multiplexing mode.

It should be noted that, in the embodiment of the present application, measuring the channel quality may obtain a signal to interference plus noise ratio (SINR) of the channel, where the SINR refers to a ratio of the strength of the received useful signal to the strength of the received interference signal (noise and interference); this can be simply understood as "signal-to-noise ratio". According to the SINR, the number of Resources (RBs) that can be allocated for uplink scheduling and a Modulation and Coding Scheme (MCS) that can be selected can be estimated, and the MCS takes the concerned factors that affect the communication rate as columns of a table and indexes of the MCS as rows to form a rate table. Therefore, each MCS index actually corresponds to a physical transmission rate under a set of parameters. The size of the data blocks that can be transmitted in the scheduling can be calculated from the RB and MCS (transport block set, TBS), where TBS refers to a set of data blocks exchanged using the same transmission channel in the same time period, and the larger the TBS is, the higher the number of transmissions in the current scheduling method is, the better the current channel quality is.

For example, the network device sends third information to the terminal device, where the third information is used to instruct the terminal device to perform communication with the network device through the single antenna port mode.

Optionally, in an embodiment of the present application, if the network device selects the closed-loop space division multiplexing mode to communicate with the terminal device, the network device sends second information to the terminal device, where the second information is used to instruct the terminal device to send the reference signal through the channel in the single antenna port mode.

In an embodiment of the present application, the second information may be periodically transmitted information. For example, in the dual antenna port mode, probing of a single antenna port is performed for 20ms every 1 second.

It should be understood that when the network device communicates with the terminal device through the closed-loop spatial multiplexing mode, the network device may instruct the terminal device to continue to transmit the reference signal, e.g., the second information, through the single-antenna port mode, and the network device may determine the channel quality of the current single-antenna port mode according to the reference signal of the single-antenna port mode transmitted by the terminal device.

Optionally, in an embodiment of the present application, if the channel quality of the single antenna port mode is better than the channel quality of the closed-loop spatial multiplexing mode, the network device communicates with the terminal device through the single antenna port mode.

For example, if the channel quality of the current single-antenna port is better than the channel quality of the current closed-loop spatial multiplexing mode, the network device sends fourth information to the terminal device, where the fourth information is used to instruct the terminal device and the terminal device to communicate through the single-antenna port mode.

Optionally, in an embodiment of the present application, the first information may be periodic information.

For example, the network device may periodically send data scheduling information to the terminal device, and the terminal device periodically sends data and reference signals to the network device according to the data scheduling information, thereby implementing periodic detection on channel quality.

Optionally, in an embodiment of the present application, the second information may be periodic information.

For example, when the network device and the terminal device communicate in the closed-loop space division multiplexing mode of the dual-antenna port mode, the network device may periodically transmit data scheduling information to the terminal device, instruct the terminal device to transmit the scheduling information in the single-antenna port mode, periodically probe the channel quality of the single-antenna port mode, and determine a preferred transmission mode between the single-antenna port mode and the closed-loop space division multiplexing mode.

According to the technical scheme of the embodiment of the application, the channel quality of the dual-antenna port mode is measured by sending the reference signal, and the reference signal is sent simultaneously with data through the data scheduling information, so that the terminal equipment can realize the optimization of the single-antenna port mode and the dual-antenna port mode under the scene that SRS resources are limited, and the uplink transmission efficiency of the terminal equipment is improved.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The foregoing describes in detail that the network device according to the embodiment of the present application detects the channel quality of the dual-antenna port mode by referring to the signal, thereby implementing the preference of the single-antenna port mode and the dual-antenna port mode. A communication apparatus according to an embodiment of the present application will be described below. It should be understood that the communication device of the embodiment of the present application may perform the foregoing methods for selecting a transmission mode of the embodiment of the present application, that is, the following specific working processes of various products, and reference may be made to the corresponding processes in the foregoing method embodiments.

Fig. 3 is a schematic diagram of a communication device according to an embodiment of the present application. The communication device may correspond to the network device in each method embodiment, and may have any function of the network device in fig. 2. As shown in fig. 3, the communication device includes a transceiver 310 and a processor 320.

Alternatively, the transceiver 310 may be referred to as a Remote Radio Unit (RRU), a transceiver unit, a transceiver, or a transceiver circuit, etc. The transceiver 310 may include at least one antenna and a radio frequency unit, and the transceiver 310 may be used for transceiving of radio frequency signals and conversion of the radio frequency signals to baseband signals.

Optionally, the communication device may include a baseband unit (BBU) including the processor 320. The baseband unit may be used for baseband processing, such as channel coding, multiplexing, modulation, spreading, etc., and for controlling network devices. The transceiver 310 and the baseband unit may be physically disposed together or may be physically disposed separately, i.e., distributed network devices.

In an example, the baseband unit may be formed by one or more boards, and the multiple boards may jointly support a radio access network of a single access system, or may separately support radio access networks of different access systems.

In one example, a network device may be divided into a Centralized Unit (CU) and a plurality of Transmission Reception Point (TRP)/Distributed Unit (DU), that is, a Bandwidth Based Unit (BBU) of the network device is reconfigured into a DU and CU functional entity.

The baseband unit includes a processor 320. The processor 320 may be configured to control the communication device to perform the respective operations in the foregoing method embodiments. Optionally, the baseband unit may further include a memory to store necessary instructions and data.

In an embodiment of the present application, the transceiver 310 is configured to send first information to a terminal device, where the first information is used to instruct the terminal device to send data and a reference signal through a dual antenna port;

the transceiver 310 is further configured to receive the data and the reference signal sent by the terminal device;

the processor 320 is configured to determine a channel quality according to the reference signal; and the network equipment determines to communicate with the terminal equipment through a single antenna port mode or a double antenna port mode according to the channel quality.

Optionally, the transceiver 310 is further configured to communicate with the terminal device through the single antenna port mode;

the processor 320 is further configured to configure the dual-antenna port for the network device and the terminal device.

Optionally, the processor 320 is further configured to demodulate the reference signal through a precoding codebook of the dual antenna port mode;

the processor 320 is further configured to determine a channel quality according to the demodulated reference signal.

Optionally, the processor 320 is further configured to demodulate the reference signal according to a precoding codebook of the closed-loop spatial multiplexing mode; and determining the channel quality of the closed-loop space division multiplexing mode according to the demodulated reference signal.

Optionally, if the channel quality of the closed-loop spatial multiplexing mode is better than the channel quality of the single-antenna port mode, the processor 320 is further configured to select the closed-loop spatial multiplexing mode to communicate with the terminal device; or

If the channel quality of the closed-loop spatial multiplexing mode is not better than the channel quality in the single antenna port mode, the processor 320 is further configured to select the single antenna port mode to communicate with the terminal device.

Optionally, if the network device selects the closed-loop spatial multiplexing mode to communicate with the terminal device, the transceiver 310 is further configured to send second information to the terminal device, where the second information is used to instruct the terminal device to send the reference signal through the channel in the single-antenna port mode.

Optionally, if the channel quality of the single antenna port mode is better than the channel quality of the closed-loop spatial multiplexing mode, the transceiver 310 is further configured to communicate with the terminal device through the single antenna port mode.

Optionally, the first information is periodically sent information.

Optionally, the second information is periodically sent information.

Optionally, the reference signal is a demodulation reference signal.

Fig. 4 is a schematic diagram of a communication device according to an embodiment of the present application. The communication device may correspond to the terminal device in each method embodiment, and may have any function of the terminal device in fig. 2. As shown in fig. 4, the communication device includes a transceiver 410 and a processor 420.

Optionally, the communication device may also comprise other main components of the terminal device, such as memory, input output devices, etc.

The processor 420 may be configured to process the communication protocol and the communication data, and control the entire communication device, execute a software program, and process data of the software program, for example, to support the communication device to perform corresponding operations in the foregoing method embodiments. The memory is primarily used for storing software programs and data. When the communication device is powered on, the processor 420 may read the software program stored in the memory, interpret and execute the instructions of the software program, and process the data of the software program.

In an embodiment of the present application, the transceiver 410 is configured to receive first information sent by a network device, where the first information is used to instruct the terminal device to send data and a reference signal through a dual antenna port; the transceiver 410 is further configured to transmit the data and the reference signal to the network device through the dual antenna port; the transceiver 410 is further configured to receive third information sent by the network device, where the third information is used to instruct the terminal device to communicate with the network device through a single antenna port mode or a dual antenna port mode.

The processor 420 is configured to select a single antenna port mode or a dual antenna port mode according to the third information to perform communication with the network device.

Optionally, the transceiver 410 is further configured to perform the communication with a network device through the single antenna port mode;

the processor 420 is further configured to obtain the dual antenna port configured by the network device.

Optionally, the transceiver 410 is further configured to transmit the reference signal according to a precoding codebook of the dual antenna port mode.

Optionally, the transceiver 410 is further configured to transmit the reference signal according to a precoding codebook of the closed-loop spatial multiplexing mode.

Optionally, if the channel quality of the closed-loop spatial multiplexing mode is better than the channel quality of the single-antenna port mode, the transceiver 410 is further configured to receive third information sent by the network device, where the third information is used to instruct the terminal device to perform communication with the network device in the closed-loop spatial multiplexing mode; or

If the channel quality of the closed-loop spatial multiplexing mode is not better than the channel quality of the single antenna port mode, the transceiver 410 is further configured to receive third information sent by the network device, where the third information is used to instruct the terminal device to perform communication with the network device through the single antenna port mode.

Optionally, if the network device selects the closed-loop spatial multiplexing mode to communicate with the terminal device, the transceiver 410 is further configured to receive second information sent by the network device, where the second information is used to instruct the terminal device to send the reference signal through the channel in the single-antenna port mode.

Optionally, if the channel quality of the single antenna port mode is better than the channel quality of the closed-loop spatial multiplexing mode, the transceiver 410 is further configured to receive fourth information sent by the network device, where the fourth information is used to instruct the terminal device to communicate with the terminal device through the single antenna port mode.

Optionally, the first information is periodically sent information.

Optionally, the second information is periodically sent information.

Optionally, the reference signal is a demodulation reference signal.

Fig. 5 shows a schematic structural diagram of a communication apparatus according to an embodiment of the present application, which may be a network device and includes at least one processor 502 (e.g., a CPU), at least one network interface 505 or other communication interfaces, and a memory 506. Communication connections between these components. The processor 502 is used to execute executable modules, such as computer programs, stored in the memory 506. The memory 506 may comprise a Random Access Memory (RAM) and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. The communication connection with at least one other network element is realized through at least one network interface 505 (which may be wired or wireless).

In some embodiments, the memory 506 stores a program 5061, and the processor 502 executes a program 5061 for performing the methods of selecting a transmission mode in the various embodiments of the present application described above.

Fig. 6 shows a schematic structural diagram of a communication apparatus according to an embodiment of the present application, which may be a terminal device and includes at least one processor 602 (e.g., a CPU), at least one network interface 605 or other communication interfaces, and a memory 606. Communication connections between these components. The processor 602 is used to execute executable modules, such as computer programs, stored in the memory 606. Memory 606 may comprise a Random Access Memory (RAM) and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. The communication connection with at least one other network element is realized through at least one network interface 605 (which may be wired or wireless).

In some implementations, the memory 606 stores the program 6061 and the processor 602 executes the program 6061 for performing the method of selecting a transmission mode in the various embodiments of the present application described above.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

It should be understood that, in the embodiment of the present application, the term "and/or" is only one kind of association relation describing an associated object, and means that three kinds of relations may exist. For example, a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of selecting a transmission mode, comprising:

the method comprises the steps that network equipment sends first information to terminal equipment, wherein the first information is used for indicating the terminal equipment to send data and reference signals through a double-antenna port;

the network equipment determines to communicate with the terminal equipment through a single antenna port mode or a double antenna port mode according to the channel quality, wherein the double antenna port mode comprises a closed-loop space division multiplexing mode or a closed-loop transmitting diversity mode;

if the channel quality of the dual-antenna port mode is better than that of the single-antenna port mode, the network equipment selects the dual-antenna port mode to communicate with the terminal equipment; or

And if the channel quality of the dual-antenna port mode is not superior to the channel quality of the single-antenna port mode, the network equipment selects the single-antenna port mode to communicate with the terminal equipment.

2. The method of claim 1, wherein before the network device sends the first information to the terminal device, the method further comprises:

the network equipment communicates with the terminal equipment through the single antenna port mode;

and the network equipment configures the double-antenna port for the terminal equipment.

3. The method according to claim 1 or 2, wherein the first information includes information indicating that the terminal device transmits the reference signal according to a precoding codebook of the dual antenna port mode, and the network device determines the channel quality according to the reference signal, including:

4. The method of claim 3, wherein the dual-antenna port mode comprises a closed-loop spatial multiplexing mode, wherein the first information comprises a precoding codebook of the closed-loop spatial multiplexing mode, and wherein the determining, by the network device, the channel quality according to the reference signal comprises:

5. The method according to claim 1 or 2, characterized in that the method further comprises:

6. The method of claim 5, further comprising:

7. The method according to claim 1 or 2, wherein the first information is periodically transmitted information.

8. The method of claim 5, wherein the second information is periodically transmitted information.

9. The method according to claim 1 or 2, wherein the reference signal is a demodulation reference signal.

10. A method of selecting a transmission mode, comprising:

the terminal equipment sends the data and the reference signal to the network equipment through the dual-antenna port;

the terminal device receives third information sent by the network device, wherein the third information is used for indicating the terminal device to communicate with the network device through a single antenna port mode or a double antenna port mode, and the double antenna port mode comprises a closed-loop space division multiplexing mode or a closed-loop transmit diversity mode;

if the channel quality of the dual-antenna port mode is better than the channel quality of the single-antenna port mode, the terminal device receives third information sent by the network device, wherein the third information is used for indicating the terminal device to communicate with the network device through the dual-antenna port mode; or

And if the channel quality of the dual-antenna port mode is not better than that of the single-antenna port mode, the terminal equipment receives third information sent by the network equipment, wherein the third information is used for indicating the terminal equipment to communicate with the network equipment through the single-antenna port mode.

11. The method of claim 10, wherein before the terminal device receives the first information sent by the network device, the method further comprises:

the terminal equipment communicates with the network equipment through the single antenna port mode;

and the terminal equipment acquires the dual-antenna port configured by the network equipment.

12. The method according to claim 10 or 11, wherein the first information includes information indicating that the terminal device transmits the reference signal according to a precoding codebook of the dual antenna port mode, and the transmitting the data and the reference signal to the network device through the dual antenna port includes:

13. The method of claim 12, wherein the dual-antenna port mode comprises a closed-loop spatial multiplexing mode, the first information comprises a precoding codebook of the closed-loop spatial multiplexing mode, and the terminal device transmits the data and the reference signal according to the precoding codebook of the dual-antenna port mode, comprising:

and the terminal equipment sends the reference signal according to the precoding codebook of the closed-loop space division multiplexing mode.

14. The method according to claim 10 or 11, characterized in that the method further comprises:

15. The method of claim 14, further comprising:

and if the channel quality of the single-antenna port mode is better than the channel quality of the closed-loop space division multiplexing mode, the terminal equipment receives fourth information sent by the network equipment, and the fourth information is used for indicating the terminal equipment and the terminal equipment to communicate through the single-antenna port mode.

16. The method according to claim 10 or 11, wherein the first information is periodically transmitted information.

17. The method of claim 14, wherein the second information is periodically transmitted information.

18. The method according to claim 10 or 11, wherein the reference signal is a demodulation reference signal.

19. A communications apparatus, comprising:

a memory for storing a computer program;

a processor for executing a computer program stored in the memory to cause the communication device to perform the method of any of claims 1 to 18.

20. A readable storage medium comprising a program or instructions which, when run on a computer, perform the method of any of claims 1 to 18.